Steam-boiler



SSheetS-Sheet 1. J. H. ELWARD.

Steam Boler. No. 232,249. Patented Sept. 14,1880.

3 Sheets-Sheet 2. J. H. ELWARD.

Steam Beiler.

No. 232,249. Patented Sept. 14,1880.

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3 Sheets-Sheet 3.

Steam Boiler. V No. 232,249. Patented Sept. I4, |880.

O O O O .//fj l gte/@amg J6@ N. PETERS. FHDTD-LITHOGRAPHER, WASHINGTON. 0 24 NiTn STATES PATENT Ormea.

JOHN H. ELW'ARD, OF STILLWATER, MINNESOTA.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 232,249, dated September 14, 1880.

Application filed May 12, 1879.

To all whom it may concern:

Be it known that I, JOHN II. ELWARD, ot' the city of Stillwater, in the county of Washington and State of hilinnesota, have invented certain new and useful Improvements in Steam- Boilers; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompan ying drawings, and to letters otl refer ence marked thereon, which form a part of this specification.

rlhe invention consists in an ash-box so constructed and arranged as to eft'ectually prevent any danger from fire.

Figure l is a view ot' an engine embodying my improvements, taken partially in side elevation and partly in longitudinal section. Fin". 2 is a rear-end view of the boiler with the smoke-box detached. Fig. 3 is a front-end View ofthe engine. Fig. 4 is a transverse vertical section of the re-'liue on line .c x of Fig. l. Fig. 5 is a section ot1 the bridge-wall on line y y of Fig. 4. Figs. 6 and 7 are rear-end views of the smoke-box and its guard. Fig. 8 is a side view of the guard. Fig. 9 is a perspective view of the hinged spout when open.

In the drawings, A3 represents the transportingwheels, upon which the engine is mounted, if it be constructed as a portable engine.

The boiler is constructed with the part A adapted to be used as the tire-place, the parts A A2, in which are mounted the heating-titles, the smoke-box B at the rear end, the smokechamber C at the front end, the smoke-stack D, the cowl E, the pump F, and the other devices ordinarily employed with similar eugines. m

In order to secure a better circulation of water in the steam-boiler, I locate the large .iue or combustion-chamber A (which extends the whole length of the boiler, and in which is constructed the furnace) in such position that upon one side of it there shall be a greater number of return-titles G G than upon the other, in order to cause an unequal division ot water and heating-surface.

rIhe engine is constructed to be heated by consuming any of the ordinary or convenient combustible materials, as coal, wood, hay, straw, shavings, taubark, die.

H represents an ordinary furnace-door, at one end of the boiler, closing the aperture through which the fuel is supplied to the furnace.

Vhen light substances, such as straw, are to be used as fuel, a feed-trough, I, is attached in place of door H. I hinge the feed-trough 6o to the boiler, so that it can be swung in the manner ot a door, and thus enable the operatorto readily obtain access to the fire above the grate when it is necessary to manipulate it (by poker or otherwise) without the trouble of detachng the trough, and without providing a supplemental door, one of which eXpedients is required by the constructions now in use.

l is a iiap valve or door situated within the 7o trough7 and arranged to automatically close the same. This door is hinged to the bottom ot' the trough, and is so arranged that when hay, straw, or other similar material is being introduced the upper end of the door will be 7 5 depressed, and will guide the fuel upward, that it may be deposited upon the top of the material which is already ignited.

I prefer to hinge valve I' by attaching it to the horizontal arm q of the bent lever G, pass- 8o ing through the side ofthe trough.

I am aware that there have been combined with engines devices adapted to catch the ashes and cinders from the tire-place, and also devices adapted to remove cinders and at the same time close the passage from the tireplace, but I am not aware of the use of acombination of devices with a portable thrashingengine, whereby the passage can be tightly closed and the hot einders and ashes can be 9o removed to a distance from the engine and the combustible material surrounding it.

Another marked advantage growing out ot my construction and combination of devices for removing ciuders and ashes is this: I can remove theash box or receptacle entirely from the boiler and engine without checking the draft-a matter of considerable importance in the use of portable engines in connectionwith thrashers, because when the straw, stubble, 10o and earth are very dry it is desi able that the einders and ashes should be removed to considerable distance, which consumes a considerable time, during which a weakening ofthe dra-ft would seriously interfere with running the engine, because of the light and transient re produced by straw. Hence the combination of three parts--a Iire-luc having an opening for the escape of ashes and cinders, a detachable ash-box, and a movable plate or section, by which the opening in the smoke-Iiue or lire-Hue can be closed-performs a new and useful result in this class of boilers and engines, and required invention, because it necessitated quite a modification and adaptation of parts.

G is a weight upon the outer and vertical arm of lever G, which is intended to hold up the free end of the valve, and thus close the trough.

In Fig. 1, K represents a chain attached to the weight and to a hook, 7c, and it will be readily seen that by means of this chain the position of the weight may be so adjusted that the valve I' shall entirely close the trough I or shall leave it partly open, in which latter case air will pass through the trough to the fire, as is sometimes desirable. This end could be attained by making the hook adjustable and adapting the lever G to en gage therewith, and thus support the weight at any desired point.

L Ll is an apron or shield hinged or otherwise attached to the trough I, for the purpose of preventing the passage of re to the inlammable material from the furnace draftdoor or from the coals that may fall from said door. In order to be adjustable Yto different lengths, it is made of two or more pieces, LL', secured together by means of set-screws l.

The ire box or chamber M is provided with a grate,'a a., ot' any ordinary or desired construction.

N is the bridge-wall7 secured in position immediatelyin rearof the grate aa. This bridge- Wall is constructed in such manner that the clinkers and other refuse which will not pass through the grate a a may be pushed over it (said wall) into the chamber M. Itis curved in such shape as to retain the fuel upon the grate when desirable to do so, but at the same time to permit the ready pushing over of the refuse, as will be seen clearly in Figs. l and 5.

Heretofore it has been customary to secure in place the bridge-wall of boiler ireiiues by rigidly fastenin them to the sides of said lues; but this is subject to much inconvenience and loss, owing to the fact that these i bridge-walls must be frequently removed and renewed.

I secure the bridge-wall in place in the following improved manner: a n, Figs. 2, 4, and 5, represent brackets secured by riveting to the sides of the tre-iiue. O is a supporting device, having the rearwardly-projectin g arms 0 o and the downwardlyprojectingarms or plates o o', which are bolted to the brackets au. The bridge-wall N is fitted to and rests upon this support O. An open space is left between the support O and the bridge-wall N, in order to admit air between them, which prevents to a large extent the burnin out of the bridgewall.

It will be seen that when so constructed and attached the bridge-wall can be removed whenever it is desired without disturbing any of the IiXed )arts of the boiler or furnace.

I? is a doorI situated beneath the bridge-wall N, and hinged to the brackets u a, as shown in Figs. 2 and 4. It is made in two parts hinged together at or near the center, so that it may fold up or swing in either direction, as shown in dotted lines, Fig. 5. The door, when thus constructed, permits the passage of a hoe or scraper from the draftdoor entirely through the ire-iiue when it is desired to push the ashes and clinkers from the chambers M and M. The door I) may be provided with perforations p p, (shown in Fig. 2,) to admit air to the chamber M', for causing amore perfect combustion.

Q represents an ash-pan situated at the rear end of the combustionchamber, beneath the smoke-box. It is fastened in such manner as to be readily detached, and, if desired, water may be placed in it to extinguish any tire or hot material which may be pushed into it. Above the ash-pan there is a sliding door or trap, Q', in lthe bottom ot' the smoke-box, arranged to close the opening` through which'the ashes and other refuse fall into the ash-pan Q, so that when the pau is being .removed for emptying or other reason the refuse may not escape from the combustion-chamber.

B is the smoke box or chamber at the rear end of the boiler, which receives the products of combustion from the re-iiue A and deiiects them back through the return-lines G G. R R' are doors opening into the rear end of this smoke-box, by means of which access can be had to the iiues when it is desired to clean them. Around the smoke-box there is placed a protector or guard, S', arranged to prevent the burning or scorching of any material that may come in contact with it. It is preferably formed of perforated sheet metal, and is pro vided with a door at the rear end. This protector S S' is placed above and entirely around the smoke-box. The perforations allow a ready circulation of air through the protector.

T T are doors beneath the smoke-stack, opening into the front smoke chamber, C, which permit the removing from said chamber of any refuse that may accumulate there.

The chamber C is constructed to surround the top and sides of the furnace A, and the bottom of the chamber is formed by the doors T, the outer cylinder ot' the boiler being cut away, as shown at A', so as to permit the refuse to drop directly from the chamber C without in any way opening the ire-tlue or ash-pit.

F is a pump for supplying the boiler with water. I provide the pump with a leakway formed by means of a return-pipe, F2, which is furnished with a stop-cock, f.

There is a valve, f', placed in the feed-pipe F'.

IOO

together when they are not intentionally disengaged. The upper part of the smoke-stack can thus loe laid down upon the engine while it is being transported. The cowl E prevents the wind from interfering with the proper operations of the currents that pass up the Vsmoke-stack.

I do not in this case claim anything relating to the arrangement of the re-flue upon one side of the center of the boiler and returntlues upon the other side of its center, as I prefer to claim any patentable feature which may be shown in such arrangement in another application which I am now preparing to tile.

What I claim isl. In combination with the lire-place M and grate a of a boiler-furnace, the horizontal feeding-trough I, having an automaticallyclosing door hinged to the bottom ofthe trough to serve as a guide for the fuel, substantiallyr as and for the purposes set forth.

2. In combination with the furnace and the extended feed trough, the extensible apron composed of the plates L and L', attached to the outer end of the trough, substantially as and for the purposes set forth.

3. In combination with the boiler-furnace A and the grate, the brackets n, secured to the furnace-wall, and the bridge-wall N, supported loosely upon said brackets, substantially as and for the purposes set forth.

4. In combination with the boiler-furnace, the grate, and the bridge-wall, the suppor-ts o, substantially as set forth.

5. In combination with the boilerfurnaee and the bridge-wall, the door P, composed of two or more parts hinged together, as and for the purposes set forth.

6. In a straw-burning engine, the combination, substantially as herein set forth, of the following elements, viz: the furnace A, the smoke-box B, arranged to receive the products of combustion and carry them upward to the return-tlues, the tight ash-vessel constructed to permanently hold a body of water beneath the smoke-box for quenching the cinders and adapted to be removed entirely from the boiler, and the sliding door Q', arranged to close entirely the opening left by withdrawing said box.

In testimony that I claim the foregoing as my own I affix my signature in presence of two witnesses.

JOHN H. ELWARD.

Witnesses:

W. F. BARsToW, H. C. PREsoor'r. 

